diff --git a/pkgs/development/python-modules/jsonrpc-websocket/default.nix b/pkgs/development/python-modules/jsonrpc-websocket/default.nix
index 8361e37239e8..c0c2fe2a8ee5 100644
--- a/pkgs/development/python-modules/jsonrpc-websocket/default.nix
+++ b/pkgs/development/python-modules/jsonrpc-websocket/default.nix
@@ -1,5 +1,5 @@
 { stdenv, buildPythonPackage, fetchPypi
-, aiohttp, jsonrpc-base }:
+, aiohttp, jsonrpc-base, pep8 }:
 
 buildPythonPackage rec {
   pname = "jsonrpc-websocket";
@@ -10,6 +10,8 @@ buildPythonPackage rec {
     sha256 = "f1aaca95db795d6a9f7bba52ff83c7fd4139050d0df93ee3a5a448adcfa0c0ac";
   };
 
+  nativeBuildInputs = [ pep8 ];
+
   propagatedBuildInputs = [ aiohttp jsonrpc-base ];
 
   meta = with stdenv.lib; {